Tabulator mechanism for type-writers.



G. W. DAVIS. TABULATOR MEUHANISM FOR TYPE WRITERS.

` APPLICATION IILBD JAN. 3, 1907. 993,583. Pmentea May 3o, 1911.

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G. W. DAVIS.

TABULATOB MBGHANISM FOB TYPE WRITERS. APPLIoATIoB FILED JAH. s. 1907.V

993,583. Patented may 3o, 1911.

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UNITED s'rArns PATENT OFFICE GEORGE WILLIAM nAvIs., or WnsTMoUNT, QUEBEC, CANADA.

i T ABULATOR MECHANISM Fon. TYPE-WRITERS.

Specification of Letters latent;

For full comprehension, however of the.

invention, reference must be had. to the ac- -fcompanying drawings forming a part of this specification in `whichlike symbols indicate the samer parts, and wherein7 Figure 1 is a rear elevation of one endof the machine 'with the carriage removed; Fig. 2 illustrates iny transverse sectional view,'the tabulator mechanism and brake coacting therewith, the escapement' and the marginal stop mechanism; Fig. 3 is -a `perspecti've view of the end -of thel machine j illustrated :in Fig. 1 the machine being turned around; Fig. 4 illustrates the pawls of the tabulating mechanism; Fig. 5 is a per-V spec'tive viewillustrating in detail the operative connection vbetween the two `of `the vparts of" the tabulatorfmechanism. Figs. 6, 7, and 8 are detail Aviewsillustrating one of the marginal stops Fig. (i being a perspective View of -a'portion of-.the toothed carrying bar with a sleeve .thereonv and Fig. 7 is a hori- -zontal sectionahview of the sleeve and plan view, of theiportion of the bar upon which it slides, WhiletFig. 8 is a transverse sectional view ofther'barl and end elevation ofthe 40 sleeve, and Fig. 9 is a detail view illustrating *il partly in lelevation and partly in section, ythe pivotal structure of the tabulator bar. l v The tabulator mechanism comprises a key 'lever 400 of bell-crankA form and provided .45 with a hub 401'through which it is fulcrumed uponnthe rigid shaft 301. A pushbar 402is pivotally connected at one end to this `bell-crank lever and its opposite end isslidably supported in a slot 403 in ,a raised ofpprtion 1403 ofthe rear part b of the main.

ame.- This bar is formed with a pairof notches `404 and 405, the former (404).. re-V ceiving anarrowcap 406 secured `rigicilly to the main; frame and retaining fsughmbar against vertical displacement, vwhile@ lowing itla limited longitudinal movementghe f .lator stops 412. These arms 408, 409 are ful;

stops, it` is' usual to control the speedaoi:its;J

.tained by a spi-mg 422, out'of bearing rela 'the bar 402y with it.

notch 405 receives the lower bent end u an arm 408 which with a second armi 409,.;J supports a bar 41.0 notched on `itslopposite@,---,- vertical sides as at 411 to receive thetbllh6() Icrumed upon the bar 1902 of the marginal stop mechanism as yshown particularlytina@ Fig. 9.. When the carriage is releasedying.ffJ connection with the use of thesetilbllllnm.,

travel to avoid undue wear of or damaged@ we, Ithe mechanism.V Accordlng to this inventlopsfwf the brake utilized is made to perform the, double function of releasing the carriage and; retarding itsV speed of travel. The depend-v. f ing arm of the key lever 400 is connectedby i a rigid link 1400 to an arm`415 connected by.y a clamping screw, 419, to a rock shaft 419. mounted in bearings inthe main .frame,.and. such shaft 416, having a brake `head 417 mounted rigidly thereon. This brake head ,i

is adapted to act upon a brake-rail 418 ses. l'

cured yrigidly to a pair of bell-crank leversr S6 fulcrumed to opposite ends of the can` 80' riage and normally yieldingly held in posi-Y, tion to be engaged by the brake head by means of springs 88, one only of which is shown. These bell-crank levers also carry',. the escapement rack which engages the pin; 85. ion 83 when such bell-crank levers are 1n. vv

normal position. spring pawl 420 adapt ed to coact with the tabulator stops, 1s,car1'* ried by one ofthe tie rods of the main riage. It is mounted in a bracket 421i Sefgd cured by a clamp 1421 to the tie rod, and re- L:

tion with the bracket.` The push bar 40211,'- andlink 1400 ,are retained yieldingly,infrJy their normal position with thelever ,400 o5 raised, by means ofl a retractile spring 1450,A connected bet-Ween the said banandlink,theA p .s(pecic effect being that the springtendsU ,y t

hrough the vtoggle actionof thel1nk-,.and lever arm 415) to increase the distance ,be'flbo .tween the shaft 416 (a fixed point) andfithei depending .arm of lever 40,0 whzichfre'suifs-n' moving the latter. toward ther ky Fd The operation` of the tabular,` l L is as follows The stops 412 are placedl'asf" usual to establish the spaces required 'for n `the brake head vactus upon the brale rail and, i,

Patented May so,j1911:' j v l'moves the escapementl -rack' out of engagecontact lwith. the stop. It is 4then released and the escapement rack again engages the pinion, thus locating the 'carriage in the reui'red position, and,- simultaneously, the tabulator bari410 swings back to its normal position, thereby removing "the tabulator stops from the path ofthe pawl. The object 'of normally yieldingly retaining thepawl out of bearing relation with its supporting bracket is -to enable the lcarriage to be run l to', say, the first stop, without touching the space bar, and be free @to be moved to ne'Xt stop. This result is obtained by the spring 22'm'o'ving the pawl beyond the y*stop it last engaged immediately it is released therefrom, otherwise the pawl would strike this stop and prevent the carriage being'released.

The marginal stop '1900 and vwrite-overmarginal-stop 1901 are arranged in diil'erent'- angular positions relatively to .a rocking bar '1902 upon which they arev adjustably mounted. This bar is rocked by means of an arm 1903 secured rigidly to the bar forked at its lower endl to straddle and efect a pivotal'connection `WithA the rear end of a push-rod 1904 held yieldingly in its forward position by a spring 1905 vbearing between a collar 1906 upon the rod. and a bracket 1907 in which the rod is guided. These stops 1900 and 1901, are formedintegrally with a pair of sleeves slidable upon the bar 1902 which is toothed 'on one side `and graduated on the other asshown in Figs. 2, 6, 7 and y8, each of such sleeves and its stop being formedby bending a single vlength ofmetal into the required form and turning its outer end outward. to constitute the stop andits inner end inward las at 1910 to' constitute a paWl to engage the teeth of the bar. These sleeves are of greater width than the bar to allow of their movement transversely thereto to disengage. the pawls from or engage them with vthe teeth of such bar, and each sleeve carries-a bow spring 1912 bearing upon the bar and holding the p'awls'yieldingly in en-L gagement. The graduationsl upon the bar are, as usual,y to indicate letter spaces.

1. In a typewriting machine the combination with the carriage, of tabulator mecha- .nism comprising a bar mounted plvotally 1ndependently of the carriage and carrying movable stops, and means mountedfrigldly noon the carriage and havmgha pawl senese mountedI therein, a horizontally lslidable key operated member, and means operatively connecting the saidvmember to the bar..

2. In a typewriting machine the combination with the carriage, of tabulator mechanismcomprising a bar mounted pivotally independently of the carriage andcarrying movable stops, means mounted rigidlyupon'" the `carriage and havin a p-awl mounted therein, a horizontally shdable key operated member having a notch, an .arm carrying the bar and engaging the notch in the slid.- able member.'

3. In a typewriting machine the combina.-

tion with the carriage, of tabulator mechanism comprising a -bar mounted pivotally independently of the carriage and carrying movable stops, means mounted rigidly upon the carriage and havin therein, a horizontally slidable key operated member, an arm. carrying the bar andpivotally connected to the slidable member.

4. Ina typewriting machine the combina-- tion with the carriage, of tabulator mecha? nism comprising a bar mounted pivotally independently of the carriage and .carrying movable stops,A apawl upon.- the carriage, a slidable key operatedmember having ay pair of notches, an arm operativelyV connected to the bar and engaging one of the notches in the `slidable member, a lug carried by the frame of the' machine and ofless widththan an'dprojecting into the other notch.

a pawl mounted'- v 5. In a typewritingmachinethe combination with` the car'ria e, oftabulator mechanism comprising `a ar mounted pivotally independentlyof the carriage andy carrying movable stops, a pawl upon the carriage, a' member projecting downwardly from such bar; a key'; a horizontally slidable bar,a pivotal connection between the vslidable bar and the said member; means operatively *A connecting the key to the slidable bar; a movable supportl upon .the carriage; means yieldingly retaining such support in normal position; a brake rail upon the yielding support, an oscillatory army carrying ay brake head, and means operatively connecting thekey to' the oscillatory arm. 6. In a typewriter the combination with' a key lever and a pair of instrumentalities operated thereby, of a pair of members connected at one end to the key lever and at their opposite ends'to the said respectiveA instrumentalities, such members normally lying. in close proximity; and a retractile' spring yieldingly retaining the members against displacement away from each other, for the purpose set forth.

7. In af`typewriterzthe combination with a carriage carrying a brake rail, of a key lever 400 ,of bell crank `form, a tabulator bar 410, an arm 407, 408 carrying the saidbar a bell crank lever carrying a brake head 'adapted to act upon the brake rail, a push bar ananas 4.02,l connecting together the first mentioned bell crank lever and the tabulator arm, a

purpose set fort 8. In a typewriting machine the combina- 't1on\with the carriage, of .a key, a brake link connecting together the said bell crank levers, and a retractile sprin connected at its ends to the push bar an link. for the rail, means yieldingly `securing such brake rail upon the carriage, a bell crank lever j carrying a brake head in 4position to be caused to engage the brake rail, and means V. .operatively connecting the key to the bell crank lever.

.. i9. In a typewriting machine the combination with the carriage, of a key, a pair of bellcrank-levers upon thecarriage, a brake rail carried by such bellcrank-levers, means' yieldingly retaining such bell-crank-levers against movement, an oscillatory arm car ing a brake head, and means operative y -connecting the key to the oscillatory arm. I10. In 'a ty ewriting machine the combination with t e carriage, of brake mechanism comprising a stop bar 410, supporting arms 408, 409, push bar 402, shaft 416 proyvided with a brake head 417, an operating arm 415, a bell-crank-key'operatively connected to the bar 402, an arm 1400 connecting the bell-crank key and the operating arm, a pinion, a yielding member, anr escapement rack carried by such member' and normally engaging the pinion, and a brake rail c'ary such member in position to be borne upon by the brake head:

' 11. In a typewriting machine the combination with the carria e having a rigid rod, and a movablev tabu ator bar carrying a movable stop, of a bracket clamped upon t-he -said frame, a stop upon the carriage, means for automatically feeding said carriage from 1 one side'of said frame to' the other, of a rocking-bar carried by the frame parallel to the line of travel of and adjacent to said carriage a marginal-stop and a write-overmarginal-stop both carried by said barand extending at different angles ltherefroni means for adjusting said two last mentione sto s, relatively to one another and longitudi nal yof said bar, a movable key means connecting the movable key to the bai` whereby the latter is rocked to different degrees for the purpose of causing either the vmarginal or 'write-over-marginal stops to intersect the; .path of the stop upon the carriage.

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13. In a typewriter, the combination with the frame t upon said frame, means for automatically feeding said carriage from one side of said frame to the other, and a stop upon the carriage, of a rocking-bar carried by the frame parallel-to the line of travel of and adjacent to said carria e, ,a series of `teeth upon one'A- side of said ar a one piece sheet metal sleeveV u on sai bar and 'slidable along same, suc sleeve being of greater transverse area than the cross-section of suchI bar, and having one end of the sheet metal from which it is formed adapted to present a nger'at theV side of said-sleeve opposite to the 'teeth' and projecting toward the `carriage and the opposite end of Vsuch sheet metal being bent to form van internal pawl'ar ranged to en age the teeth, a spring carried by the side o the sleeve opposite to the pawl and bearing u on the gra uated lside adjacent thereto o the bar, a movable key and an o rative connection between said lmovereof, a carriage supported able ey and the bar whereby said bar is rocked to move saidnger into or'out of the path of the stop u on the carriage for the` purpose of establis ing a margin upon the sheet being written or allowing said margin to be overwritten. f,

In testimony whereof, I have signed myI name to this specification, in the presence `of two subscribing witnesses.

GEORGE f WILLIAM DAVIS.

Witnesses:

WILLIAM lr. MoFEA'i, f' FRED J. SEARS. 

